Bunsen burner.



L. J. STRAUSE & 0. SPAHR.

BUNSBN BURNER.

APPLICATION FILED JAN. 1o, 1914.

Patented Nov. 24, 1914.

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ATTURNEYS ductor of heat.

,UNITED s'rnrnsmi'nrirr Ferca- LOUIS J'. STRAUSE ANDIOTTO SPAHR, OF PHILADELPHIA, PENNSYLVANIA, ASSIG-NORS TO S'JRAIIJ'SE` GAS `IRON CO., OF PHILADELPHIA, PENNSYLVANIA, ACORPORATION OF PENNSYLVANIA.

B'UNSEN BURNER.

Application led January 10, `1914.

Our invention relates to Bunsen burners i of the type particularly adapted for use in connection `with gas stoves, incandescent gas lamps, self heating gas irons, and the like and has for its object to construct such burners in a manner to protect the customary iiexible fuel conducting tube from the injurious effects of the heat produced by the burning `fuel when the stove, lamp, iron or the like is in operation. Our invention further contemplates the provision of an improved and simple connection for operatively attaching such tubes with said burners and further has for its purpose to iinprove the needle valve adjusting means in certain types of said burners. Our invention will befully described hereinafter and the features of novelty will be pointed out in the appended claims.

Reference is to be had to the accompanying drawings which illustrate certain examples of our invention and in which- Figures 1, 2, 3 and 4 are longitudinal sections, some partly in exterior, of different forms of our improvements and Fig. 5 is a horizontal-section on the line 5-5 oit' Fig. 1. Referring more particularly to Fig. l of the drawings 10 represents `an air hood which may be of any suitable or desired construction and as shown is externally screwthreaded to accommodatean `air regulating shutter 11 of any desired type adapted to.cooperate with the usual air inlets 12 for regulating the amount of air admitted tosaid air hood for` admiXture with the gaseous fuel. The said hood 10 is further internally screw-threaded to receive the reduced neck 13 of a bushing 14 formed of iiber or other insulating material which is a non con- -The customary metallic nipple 15 is formed with an externally screw-threaded reduced neck 16 arranged to screw into the bushing 14 and is further pro vided with a central passage 17 terminating in an enlarged chamber 18 which is inter'- nally screw threaded at least at its inner end to receive the screw-threaded neck .19 of the Specification of Letters Patent.

Serial No. 811,314.

nozzle 20. The said nozzle 20 in this form 01:' our improvement is thus carried by the nipple 15 and may be made readily accessible when this is desired for any purpose by simply unscrewing said nipple 15 fromsaid bushing 14. The air-hood 10 is detachablv connected with the burner tube either of a gas stove, an incandescent` gas lamp or of a self heating gas iron or the like in any `cus-` tomary manner as by screw-threading and theone end of the usual flexible tube 2l for supplying the iuel is slipped over the niple 1o.

With ordinary `constructions the heat from the burner is conducted along the various metallic tubes forming part of the de-i vice and by coming into contact with the said fuel tube, which is usually constructed of rubber lor a combination of rubber and some other substance, vulcanizes the said tube upon the nipple so as to prevent its removal therefrom without injuring the tube or otherwise injuriouslyafectin .it.- The life of the tube in such construction ,is thus materially reduced and the same is ofttiines rendered leaky and dangerous to ilse. In

the present construction so far `describedl the above objections are absolutely overcome s and the said tube is `effectively insulated against the effects of said heat by the insulatingbushing 14 which absolutely arrests the conduction of said heat and prevents the same from reaching the tube 21. This is acoomplished by locating the bushing `14 be-` tween the nipple 15 and the point at which the heat is generated, for instance, as is shown in Fig. l and described in the` specification.

In the form shown Fig.; 2 a metallic s nut 22 provided with a reduced externally screwthreaded neck 23 1s screwed into the air hood 10 and 1s further formed with a Patented Nov. 24,1 1914.?`

central longitudinal passage 24 which `is` screw-threaded to receive the reduced neck 19 of the nozzle 20. In this form `the said ioo nozzle 9.0 is thus carried by said nut instead of being directly attached to the nipple 15fI as in the first form described. The said nut in addition is provided with an internally screw-threaded recess into which the reduced externally screw-threaded neck 13 of municating with the passage 9.4 and the nozna'lly screw-threaded neck `16b adapted to 'iso zle 20. In the form at present being described the nipple 15a is formed with a reduced externally screw-threaded neck 16a adapted to screw4 into an internally screwthreaded recess formed in the bushing 14a. As will be seen by referring to Fig. 2 the passage 17*a of the nipple 15L connects with the channel 25 and thus establishes communication between the nozzle 20 and the source of fuel supply through the medium of the tube 21 which in this instance also has its one end slipped over the said nipple 15a. Thus as in the form shown in Fig. 1 the insulating bushing 14a by being located between the nipple 15a and the point at which heat is generated completely protects the tube 21 from the effects of said heat.

1n the form shown in Fig. 3 the entire nipple 15b is constructed of a material which is a poor conductor or a non-conductor of hea-t and is provided with a reduced exterscrew directly into the air hood 10. In this ferm as in the form illustrated in Fig. l the nipple is provided with a passage 17b terminating in an enlarged chamber 18b 4into whichfthe 'screw-threaded neck 19 `of the nozzle v20 is screwed. It will readily be seen that 'in the form now being described the entire-nipple 15b being made of heat insulating material protects the tube 21 from the effects of Athe heat produced7 the said tube in this case also having its one end slipped over said nipple.

In Fig. 4 we have illustrated a type of burner in which a needle valve is used in combination with the lnozzle to regulate the flow yof lfu'elto the air hood. In said figure a metallic Ytube 26 has a reduced externally screw-threaded neck 27 which is screwed into the airhood 10 and which is internally screwithreaded atleast at its one end lto 'receive the externally screw-threaded reduced neck 13c of the insulating `bushing 14C. The said bushing 14C is yfurther formed with a reduced neck 13d upon which an externally screw-threaded metallic ring l14d is secured in any suitable manner, thek neck 13d preferably projecting slightly beyond the ring 14d as clearly shown in Fig. 4. In the form being described the flexible tube 211a instead of being slipped over a nipple Ias in the previous forms has its one end secured to a sleeve 21b provided with an 'annular Viange 2lc upon which a coupling ring 21d is rotatably mounted or swiveled, said ring being held against separation from the sleeve 21b bymeans vof an annular flange 21e which cooperates'with the iiange 21C as will be 'clearly apparent from an inspection of Fig. 4. The coupling ring 21d is internally screw-threaded and is adapted tc be screwed upon the "screw-'threaded ring 14d by being rotated 'upon lthe sleeve 21". This rotation of lthe 'ring 2ld to connect the tube 21eL with the with the burner without any twisting of the tube 21a so 'that the tube is protected against injury from this twisting, and from any other cause and the opposite end of said tube may be connected with the source of fuel supply before the tube and burner are connected if this should be desired. At the same time an absolutely rigid connection between the tube and burner is secured and the danger of accidental separation thereof is entirely done away with. The bushing 14 in the form described is also provided with a longitudinal chan/nel whereby communication between ythe tube 21CL vand the burner is established. lt will lbe seen that in this form also the insulating bushing is 4located between the tube 21ra and the point at which heat is generated so that said tube is pro tected against the injurious 'effects of said heat. In this last form a 'needle valve 27a coperates with the nozzle 20 to regulate the supply of fuel to the air hood `10 and is under the influence of a spring 28 which tends to force said needle valve 27 out of and away from the yenit opening of the nozzle 20. rlhe said needle valve 27 is forced toward and into the vsaid exit aperture by means of a cam surface 29 forming partof a stem 30 which extends through and is in screw-threaded engagement with a tubular extension 31 located on the tube 26. 'The said stem 30 is provided with an'operating head 30a by means of which the `stem -is moved lengthwise of Vthe extension 31 through the coperation ofitlrescrew-'threads on said stem and extension andthe surface 29 is moved relatively to the valve 27 to either move said needle valve finto'the'eXit opening `of the nozzleor permit'the spring-28 to force the said needle out of'said opening. In order vthat a line degree of `adjustment ofthe needle valve 27 may be vobtained-and that said valve may Abe rigidly lheld in any adj usted vposition we form the'operating head 30@L with a knurled-or 'milled peripheral ledge 32 and provide a resilient'de'tent 33 adapted to coperate with said milled or knurled edge 32 as will bereadily apparent from an inspection of Fig. '4. The said detent may be lsecured in operative. position and as ico izo

'shown is clamped between the end of lthe tube 26 and the end 'of the air hood 10. lt will be -seen that with this construction the rotative movement of ithe head 50a and the movement of the'cam surface-29 are `posi- T30 tively controlled through the coperation of the milled edge 32 and the detent 33 and in consequenceavery delicate and fine adjustment of the needle valve 27 is possible. At the same time the cooperation of the said milled edge and detent will rigidly maintain the said head 3() and the needle valve 27 in any adjusted position and will prevent unintentional or accidental disarrangement thereof through vibration or from other causes.

It will be seen that all forms of our improvement provide for the absolute protection of the fuel conducting tube against the eilects of heat and at the saine time We provide an improved and simple means for connecting said tube with the burner. In addition to this the needle valve adjusting means is improved in action and efliciency. It is to be understood that the type of 'needle valve mechanism illustrated is only an eX- ample and that our improved detent and operating head may be operatively combined with other forms of such mechanism. It is further to be understood that in all forms of our improvement the heat insulating means may be constructed of any suitable material and may comprise means other than the bushings shown and described and also that the insulating means may be combined `or indicated in Bunsen burners or the like of other constructions than those shown.

Various changes in the specific forms shown and described may be made Within the scope of the claims Without departing from the spirit `of our invention.

We claim i.

l. A Bunsen burner of the kind described comprising an air hood, a nozzle carrying .means connected with said air hood, a rigid bushing of insulating material connected with said nozzle carrying means and adevice adapted for connection with a iuel conducting tube carried by said bushing.

2. A Bunsen burner of the kind described comprising an air hood, a nozzle carrying tube in, screw-threaded engagement with said air hood, an insulating tube in screw threaded engagement with said nozzle car-` rying tube and a device adapted for connection with a fuel condl'icting tube carried by said insulating tube.

3. A Bunsen burner oit' the kind described comprising an air-hood, a nozzle carrying tube connected therewith, a bushing of insulating material connected with said tube and a screw-threaded ring connected with said bushing.

el. The combination of a Bunsen burner ol the kind described, a bushing of insulating material connected therewith, a screwthreaded ring carried by saidbushing, said bushing having an end projecting beyond said ring, a fuel conducting tube, and a` coupling ring rotatably mounted on said tube and adapted ior connection with said screw-threaded ring whereby the end of said tube is drawn against the projecting end of said bushing.

In testimony whereof, we have hereunto set our hands in the presence of two subscribing witnesses.

LOUIS J. STRAUSE. OTTO SPAHR.

Witnesse z JACK S. BERNsTnIN, JfH. HOWARD.

copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Iatents,

Washington, D. C. 

